CN1947531A

CN1947531A - Multi-functional antistaling agent for fruits and vegetables

Info

Publication number: CN1947531A
Application number: CN 200610125844
Authority: CN
Inventors: 汪东风; 吴昊; 张宾; 汪曙晖
Original assignee: Ocean University of China
Current assignee: Ocean University of China
Priority date: 2006-08-29
Filing date: 2006-08-29
Publication date: 2007-04-18
Anticipated expiration: 2026-08-29
Also published as: CN100548129C

Abstract

A multifunctional antistaling agent for holding the freshness of fruit and vegetable and degradating the residual agricultural chemical (organic phosphorus) on the surface of fruit and vegetable is prepared from marine polyose and RE elements through preparing marine polyose-RE match. It can be coated on the surface of fruit and vegetable.

Description

A kind of multi-functional antistaling agent for fruits and vegetables

Technical field the present invention utilizes marine polysaccharide and rare earth element to prepare a kind of multi-functional antistaling agent for fruits and vegetables.This antistaling agent has in the hydrolysis fruits and vegetables organophosphorus pesticide and function such as fresh-keeping, is a kind of novel fruit and vegetable fresh-keeping agent, is widely used in fields such as fruits and vegetables preservation and processings of farm products.

Background technology China fruits and vegetables output is at the forefront in the world, but is subjected to fresh-keeping reserve capabillity restriction, and it is serious to cause fruits and vegetables to lose in the process of circulation after harvesting, and the annual loss late of fruits and vegetables is about 25%～30%, nearly 80,000,000,000 yuan of loss total value.Most widely used in the world postharvest technology of fruits and vegetables is air conditioned storage and cryopreservation at present.But because controlled atmosphere and cryopreservation investment are big, China is difficult to popularize in a short time.And, need every year a large amount of organophosphorus pesticides be used to prevent and treat the fruits and vegetables disease and pest because China is a fruits and vegetables big producing country.Though organophosphorus pesticide has great role on the volume increase of fruits and vegetables is guaranteed the quality, its residual harm that brings but can not be ignored.Therefore, how to improve the storage period of fruits and vegetables and reduce the residual of organophosphorus pesticide, be the urgent problem that people extremely are concerned about always.

Marine polysaccharide has good film-forming property, good permeability, but characteristics such as sterilization, it is coated fruit and vegetable surfaces, can form the thin semipermeable membrane of one deck, can suppress water evaporates, regulate respiration, prevent the microorganism dip-dye, improve lustrous surface, regulate the physiological metabolism after fruit is adopted, and many microorganisms are had inhibitory action, can prolong the freshness date of fruits and vegetables effectively, and safety non-toxic.Rare earth ion not only has bacteriostasis more widely, and the ability of degrading organic phosphor pesticides is arranged, but rare earth ion easily is gel under neutral physiological condition, has limited its application in fresh-keeping.Marine polysaccharide has good complexing because of having adjacent hydroxyl and amino in its molecule to some metal ions especially rare earth metal.Therefore marine polysaccharide and rare earth complex are prepared the marine polysaccharide rare earth compounding and film, the degraded of the fresh-keeping and organophosphorus pesticide of fruits and vegetables is had good effect in fruit and vegetable surfaces.

Summary of the invention the present invention utilizes marine polysaccharide and rare earth element to prepare the marine polysaccharide rare earth compounding, and it not only has preservation to fruits and vegetables, prolongs storage period about 5 days; Its degrade the in addition effect of organophosphorus pesticide in the fruits and vegetables, the organic phosphorus pesticide degradation rate reaches more than 60%.This complex cost is low, and is easy to operate simple, is easy to apply.

Technological process is as follows: rare earth is dissolved in the acetum, fully add marine polysaccharide behind the mixing, swelling treats to dissolve fully the back magnetic agitation, regulates pH, separate out complex, continue reaction 3～5 hours, fully clean decompress filter with the mixed solvent of ethanol and acetone, 40 ℃ of vacuum drying promptly get the marine polysaccharide rare earth compounding.During use the marine polysaccharide rare earth compounding that makes is dissolved in the acetum, fully pH is reconciled in the dissolving back, and fresh fruit of vegetables was flooded in the complex that makes 1～15 minute, takes out the back natural air drying, and room temperature storage gets final product.

The specific embodiment will be dissolved in 0.1%～1% acetum with respect to the rare earth of acetum 0.01%～0.09%, fully add marine polysaccharide behind the mixing with respect to acetum 0.2%～2%, swelling 12～18 hours treated to dissolve fully the back magnetic agitation 12～24 hours, regulated pH to 5.0～7.0, separate out complex, continue reaction 3～5 hours, with the fully cleaning of mixed solvent (1: 1) of ethanol and acetone, decompress filter, 40 ℃ of vacuum drying promptly get the marine polysaccharide rare earth compounding.During use the marine polysaccharide rare earth compounding that makes is dissolved in 0.1%～1% acetum, fully pH to 2.0～7.0 are reconciled in the dissolving back, and fresh fruit of vegetables was flooded in the complex that makes 1～15 minute, take out the back natural air drying, and room temperature storage gets final product.

Example one: get ammonium ceric nitrate 0.06g, among the acetum 100ml of adding 0.5%, abundant stirring and evenly mixing, add the 0.4g shitosan, placed 12 hours natural swelling under the room temperature, after treating to dissolve fully, magnetic agitation 24 hours is regulated pH to 5.0, separate out complex, continue reaction 3 hours, with the fully cleaning of mixed solvent (1: 1) of ethanol and acetone, decompress filter, 40 ℃ of vacuum drying promptly get the marine polysaccharide rare earth compounding.The marine polysaccharide rare earth compounding that makes is dissolved in 0.5% acetum, and fully pH to 4.0 is reconciled in the dissolving back, and fresh fruit of vegetables was flooded 10 minutes in the complex that makes, and takes out the back natural air drying, and room temperature storage gets final product.

Example two: get ammonium ceric nitrate 0.02g, among the acetum 100ml of adding 0.9%, abundant stirring and evenly mixing, add the 1g shitosan, placed 16 hours natural swelling under the room temperature, after treating to dissolve fully, magnetic agitation 12 hours is regulated pH to 6.0, separate out complex, continue reaction 5 hours, with the fully cleaning of mixed solvent (1: 1) of ethanol and acetone, decompress filter, 40 ℃ of vacuum drying promptly get the marine polysaccharide rare earth compounding.The marine polysaccharide rare earth compounding that makes is dissolved in 0.9% acetum, and fully pH to 6.0 is reconciled in the dissolving back, and fresh fruit of vegetables was flooded 3 minutes in the complex that makes, and takes out the back natural air drying, and room temperature storage gets final product.

Example three: get cerium chloride 0.04g, among the acetum 100ml of adding 0.2%, abundant stirring and evenly mixing, add the 1.5g algal polysaccharide, placed 16 hours natural swelling under the room temperature, after treating to dissolve fully, magnetic agitation 18 hours is regulated pH to 7.0, separate out complex, continue reaction 4 hours, with the fully cleaning of mixed solvent (1: 1) of ethanol and acetone, decompress filter, 40 ℃ of vacuum drying promptly get the marine polysaccharide rare earth compounding.The marine polysaccharide rare earth compounding that makes is dissolved in 0.2% acetum, and fully pH to 6.0 is reconciled in the dissolving back, and fresh fruit of vegetables was flooded 2 minutes in the complex that makes, and takes out the back natural air drying, and room temperature storage gets final product.

Claims

The preparation technology of 1 one kinds of multi-functional antistaling agent for fruits and vegetables, its feature process flow process is as follows: rare earth is dissolved in the acetum, fully adds marine polysaccharide, swelling behind the mixing, treat to dissolve fully the back magnetic agitation, regulate pH, separate out complex, continue reaction 3～5 hours, mixed solvent with ethanol and acetone fully cleans, decompress filter, 40 ℃ of vacuum drying promptly get the marine polysaccharide rare earth compounding.During use the marine polysaccharide rare earth compounding that makes is dissolved in the acetum, fully pH is reconciled in the dissolving back, and fresh fruit of vegetables was flooded in the complex that makes 1～15 minute, takes out the back natural air drying, and room temperature storage gets final product.
Among the preparation technology of 2 a kind of multi-functional antistaling agent for fruits and vegetables according to claim 1, the concentration of acetum is 0.1%～1%.
Among the preparation technology of 3 a kind of multi-functional antistaling agent for fruits and vegetables according to claim 1, treat that the marine polysaccharide rare earth compounding dissolves fully after, regulate pH, its pH adjustable range is 3.0～7.0.
Among the preparation technology of 4 a kind of multi-functional antistaling agent for fruits and vegetables according to claim 1, polysaccharide is shitosan or algal polysaccharide, and the addition of polysaccharide is with respect to 0.2%～2% of acetum.
Among the preparation technology of 5 a kind of multi-functional antistaling agent for fruits and vegetables according to claim 1, rare earth is any in ammonium ceric nitrate, cerous nitrate, ceric sulfate, the cerium chloride, and the addition of rare earth is with respect to 0.01%～0.09% of acetum.
Among the preparation technology of 6 a kind of multi-functional antistaling agent for fruits and vegetables according to claim 1, swelling time is 12～18 hours behind the adding marine polysaccharide.
Among the preparation technology of 7 a kind of multi-functional antistaling agent for fruits and vegetables according to claim 1, add marine polysaccharide, swelling, treating to dissolve fully the back magnetic agitation time is 12～24 hours.
Among the preparation technology of 8 a kind of multi-functional antistaling agent for fruits and vegetables according to claim 1, regulate pH after the magnetic agitation, its pH adjustable range is 5.0～7.0.